请问获取ios启动时长，使用h5如何写

以下是ios的代码

- (time_t)uptime {  
  struct timeval boottime;  
  int mib[2] = {CTL_KERN, KERN_BOOTTIME};  
  size_t size = sizeof(boottime);  
  time_t now;  
  time_t uptime = -1;  
  (void)time(&now);  
  if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 && boottime.tv_sec != 0)  
  {  
    uptime = now - boottime.tv_sec;  
  }  
  return uptime;  

}